So apparently I need to spell out the joke.
Ravnica isn't the urban fantasy genre. Just because it is fantasy and has an urban environment, doesn't make it the urban fantasy genre, any more than the presence of death knights makes Dragonlance Gothic horror despite some tragic and spooky elements.
I realize sarcasm is the lowest form of whit, but I was only attempting to draw comparison between people saying Pholtus or Planescape qualifies as urban fantasy by saying that by that metric, Krynn is a horror setting.
Are we clear now?